[ancient_geezer]

Abrose, taking a look on ESA's website and info on that picture it is not clear that that is nothing more a color rendition of depth from their 3D cameras, much like a colorcoded topomap. I doubt very much the greens and blues are from water or chlorophyll. Either would be assayable from spectrographic data available to the satellite instrumentation. That kind of result has not been claimed by ESU in any of their reports, and certainly would be news of the first magnitude if it were the case.

That particular picture is a computer reconstuction of height derived from their 3D cameras from an overhead view. The color may just range red, yellow, green, blue from high to low relative altitude, * luminosity of the original picture.

[ambrose]

It definitely isn't a real picture. It looks like some sort of lithograph you might find for sale in an art galley. Still, any evidence of water/ice is pretty darn exciting.